Piston-packing.



G. N. SOWDEN.

PISTON PACKING.

APPLIUATION FILED SEPT.4,1913.

Patent ffi May 19, 1914.

n 0 T N M N ATTORNEYS CHAIR/LES N. SOWDEN, 0F GUANTANAMO, CUBA.

PISTON-PACKING.

nooasca.

Specification of Letters Patent.

Patented May 19, 1914.

Application filed September 4, 1913. Serial No. 788,086.

To all whom it may concern Be it known that l, CHARLES N. Sowonn, asubject of the King of Great Britain, and a resident of Guantanamo,Santiago de Cuba Province, Cuba, have invented a new and ImprovedPiston-Packing, of which the following is a full, clear, and exactdescription.

My present invention is intended more particularly for embodiment inhydraulic pistons employing a cup packing, and it is a design of theinvention to provide a novel means associated with the cup packing toprevent the latter from being forced between the piston and cylinderwall when either or both become -worn.

The invention will be particularly explained in the specific descriptionfollowing.

. Reference is to be had to the accompanying drawings forming a part ofthis specification, in which similar characters of reference indicatecorresponding parts in all the views.

Figure 1 is a longitudinal transverse section through a cylinder andpiston showing a practical embodiment of my invention; Fig. 2 is a frontview of the piston, with parts broken away; and Fig. 3is a perspectiveview of one of the sections of a ring employed beneath the cup packing.

The invention is illustrated in connection with a piston 10 operating ina cylinder-'11. A flexible packing 12, of leather or equivalent materialis clamped tothe face of the piston by a clamp plate 13, secured by abolt 13 or the like. Extending around the piston in an annular groove inthe face thereof, at the back, of the flexible packing is a sectionalring composed of radially separated sections 14, which are seated on aring 15; Un the under side of each section 14 is a radial rib .14? whichis received in a corresponding radial groove 15 of the ring 15.

A clamp ring 16 is secured by'screws 17 or thelike to the. face of thepiston 1(l'beneath the flexible-packing '12, and overlaps the inner endsof the ring sections 14:, there being ribs 16 on the-ring 16 which arereceived in transverse grooves 14 on the face of eachsection 14, saidgroove 14 being curved and the grooves of the several sections aliningto receive therib16 of the clamp ring, said rib extending annularly.

Adjacent to the-outer edgeof the sectional ring each member 14thereof-is beveled on the forward face, as at 14, presenting an outwardand forward flare relatively to a the cup thereof.

. radial line, the beveled surface or flare ex tending to the peripheryof the ring, at an angle to the latter, thereby forming angular edgeportions at the periphery of the said sectional ring. Similarly theadjacent surface of the clamp ring 16 has a reverse bevel 16 extendingtherearound, so that an annular depression is formed between the beveledsurfaces 14: of the sectional ring and the beveled surface 16 of theclamp ring. The clamp plate 13* that secures the flexible packing has anannular rib on its inner face, at the periphery which is received in thedepression formed by the surfaces 14, 16".

To receive the several detachable elements, the piston head is formedwith an annular rabbet or recess 10 in which the ring 15 is firstseated, said recess accommodating also the sectional ring 14 in front ofthe ring 15. To receive the clamp piston has a further annulardepression 10", of less radius than the depression 10 and the clamp ring16 will be received flush with the'face of the piston so that thepacking leather 12 is backed by the face of the piston, by the annularclamp ring 16, and will be backed adjacent to the wall of the cylinder11 by the sectional ring formed by the elements 14. Owing to the bevels14, 16", the annular rib 13 of the clamp ring 13 will bend the packingmaterial inwardly, and the pressure exerted on the acking ring, actingagainst the beveled sur aces 14, will force the ring sections 14outwardly'against the cylinder wall, thereby preventing the cup packingfrom being forced between the piston and the wall of the cylinder. Theclamp ring 13 is of sufficiently less diameter than the cylinder toreceive the cuppedouter edge 12 of the packing between the said clampring and the cylinder.

Having thus described my invention, I claim as new, and desire to secureby Letters Patent: k 1

1. In aiston, a on ac ing, a 0 am on the piston for said gaiiking, andbacking means for the cup of the packing, said means comprising asectional ring composed of radially disposed sections, the forwardsurface of which at the edge is beveled to flare outwardly and forwardlyforming with the outer cylindrical surface of the sectional rin angularedge members on said sections fittlng at the back of the packing,outside of Y 2. In a piston, a cup packing, a clamp on ring 16, the faceof the the piston for said packing, and backing means for the cup of thepacking, said means comprising a sectional ring composed of radiallydisposed sections, the forward surface of which, at the edge, is beveledto flare outwardly and forwardly, forming with the outer cylindricalsurface of the sections angular edge members fitting at the back of thepacking, outside of the cut thereof, the clamp for the packingpresenting a wedge member and the base of the cup packing being clampedbetween said wedge member and the angular members on the sectional rmg.

3. In a piston, a cup packing, a sectional ring extending around thepiston beneath the packing, near the edge thereof and composed ofradially movable sections, a clamp ring beneath the packing andoverlapping the sectional ring, at the inner side of the latter, saidclamp ring and the sectional ring presenting opposite spaced beveledsurfaces, and a packing clamp secured to the piston over the packingandhaving an annular wedge member on the inner face pressing the packing atthe base of the clip against the mentioned beveled surfaces.

4. In a piston, a cup packing, a sectional ring extending beneath thecup of the packing and presenting a front surface flaring outwardly andforwardly at the outer portion forming a tapered, forwardly disposedannular edge, and means for pressing the cup of the piston outwardlyagainst said tapered edge.

5. A piston having an annular depression in the face thereof, at theperiphery, and a second annular depression in the face inward from thefirst depression, and complementary thereto, a seat ring in the firstdepression, a sectional-ring on said seat ring, said seat ring havingradial grooves and there being radial ribs on the members of thesectional ring movable in said grooves, a clamp ring in the seconddepression overlapping the sectional ring, the clamp ring having anannular rib and the sectional ring presenting an annular groovereceiving the said rib and being of greater width radially to permitrelative movement of the members of the sectional ring, and a clamp diskon the piston over the packing, the cup of the packing having its edgeportion extending around the outside of the clamp disk, said disk havingan annular wedge ring inward from the edge at the inner side, and thesectional ring and its clamp ring presenting opposed bevels betweenwhich the packing is pressed by the rib of the clamp disk.

6. In a piston, a cup packing, a sectional ring beneath the cup of thepacking at the outer side of said cup, said sectional ring presenting aflaring surface, an element spaced radially inward from the flaringsurface of the sectional ring and beveled oppositely thereto, and apacking clamp having a wedge ring on the under side corresponding withthe space between the flare of the sec tional ring and the bevel of theclamp ring. In testimony whereof I have signed my name to thisspecification in the presence of two subscribing witnesses.

CHARLES N. SOWDEN. Witnesses:

HERMANN ROTH, CHESTER E. ABBOTT.

